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A great collection of articles and essays, including a couple of underground classics such as "The Mushroom Entheogen" by C.B. Gold and "Apparent Communication with Discarnate Entities Related to DMT", by Peter Meyer. [ID:PsychedelicMonographs6]

The most comprehensive book on Trichocereus genus cacti in existence. A marvelous reference book that contains more than you need to know! A must have for anyone interested in mescaline-containing cacti. [ID:TroutSanPedro]

PiHKAL (Phenethylamines I Have Known and Loved) by Alexander & Ann Shulgin is both a novel and a reference book. The first half is a narrative story of the authors' life, relationship, and experience with psychoactive drugs. The second half is a ground breaking encyclopedic guide to 179 Phenethylamines (such as MDMA/Ecstasy, 2C-B, 2C-T-7, and DOB) focused on chemistry and sysnthesis, but also including first hand reports for most subtances.
[Soft Cover. 978 pgs. 1991/1998.] [ID:PiHKAL]

The most comprehensive book on Trichocereus genus cacti in existence. A marvelous reference book that contains more than you need to know! A must have for anyone interested in mescaline-containing cacti. Signed by author K. Trout. [ID:TroutSanPedroSgnTrout]

TiHKAL (Tryptamines I Have Known and Loved) also by Alexander & Ann Shulgin is in the same format as PiHKAL, first half narrative and second half description of the chemistry, synthesis, and experiences of 55 Tryptamines (such as LSD, Psilocybin, DMT, and 5-MeO-DMT).
[Soft Cover. 804 pgs. 1997.] [ID:TiHKAL]

2015. Attracting the attention of experimentalists and prohibitionists, scientists and artists, alchemists and hyperspace emissaries, the psychoactive compound DMT is a unique story unto itself. Until now, this story has remained untold. Mystery School in Hyperspace is the first book to delve into the history of this substance, the discovery of its properties, and the impact it has had on poets, artists, and musicians. [ID:MysterySchoolHyperspace]

This book (2007 2nd Edition) is a valuable reference for researchers, scholars and anyone interested in the tryptamines, especially naturally occurring tryptamines. It is a compendium of current knowledge, and undoubtedly the best detailed reference for information about these materials. [ID:SomeSimpleTryptamines2]

2009. Through studying the origins and roots of words common to Sumerian and subsequent Middle Eastern languages, John Allegro has been able to show how ideas carried in these words continued into the beliefs, myths and practices of later religions, including Judaism and Christianity. Many of the stories and characters of the Old and New Testament, as well as Greek myths, are seen to be founded on the fertility religions of our ancestors. At the centre of the ancient cult, as the source and embodiment of its myths and rituals, was the sacred mushroom, Amanita muscaria. Allegro asks how far it remained central to biblical traditions, and his findings overturn all conventional views of religion in our time. 40th Anniversary Edition. [ID:SacredMushroomAndTheCross]